Temperature dependence of oxygen isotope fractionation of CO 2 from magnesite-phosphoric acid reaction

Sharma, Somya; Patil, D. J.; Gopalan, K.

doi:10.1016/s0016-7037(01)00833-x

Cited by 83 publications

(39 citation statements)

References 12 publications

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“…In fact, the reaction time does not have influence on the d18O value (Das Sharma et al, 2002). Unfortunately, no publication on the influence of the reaction time on the D47 value is available to date in the literature.…”

Section: ) Provide More Details Of Clumped Isotope Methods and Calcumentioning

confidence: 99%

Paired stable isotopes (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe

Quesnel

Boulvais

Gautier

et al. 2016

Geochimica et Cosmochimica Acta

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The stable isotope compositions of veins provide information on the conditions of fluid-rock interaction and on the origin of fluids and temperatures. In New Caledonia, magnesite and silica veins occur throughout the Peridotite Nappe. In this work, we present stable isotope and clumped isotope data in order to constrain the conditions of fluid circulation and the relationship between fluid circulation and nickel ore-forming laterization focusing on the Koniambo Massif. For magnesite veins occurring at the base of the nappe, the high d18O values between 27.8‰ and 29.5‰ attest to a low temperature formation. Clumped isotope analyses on magnesite give temperatures between 26°C and 42°C that are consistent with amorphous silica -magnesite oxygen isotope equilibrium. The meteoric origin of the fluid is indicated by calculated d18Owater values between -3.4‰ to +1.5‰ Amorphous silica associated with magnesite or occurring in the coarse saprolite level displays a narrow range of d18O values between 29.7‰ and 35.3‰. For quartz veins occurring at the top of the bedrock and at the saprolite level, commonly in association with Ni-talc-like minerals, the d18O values are lower, between 21.8‰ and 29.0‰ and suggest low-temperature hydrothermal conditions (~40-95°C). Thermal equilibration of the fluid along the geothermic gradient before upward flow through the nappe and/or influence of exothermic reactions of serpentinization could be the source(s) of heat needed to form quartz veins under such conditions. Dear Editor, Please find attached the revised version of manuscript #GCA-D-15-00678, entitled "Paired stable isotope (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe", by B. Quesnel, P. Boulvais , P. Gautier, M. Cathelineau, C.M. John, M. Dierick, P. Agrinier and M. Drouillet, which required moderate revisions before final acceptance for publication in Geochimica et Cosmochimica Acta. You can find on this file our answers (in red below) to reviewer's comments. Accordingly to these comments, the text and some figures have been modified. For the text, we have let these changes visible on the manuscript to make easier your lecture. Note also that we have taken into account the minor editorial suggestions of reviewers (for example those noticed in yellow boxes in pdf files); these changes do not appear in the new version. We have also built new tables that could be useful for the geochemists community; these calculations have been suggested by reviewers 1 and reviewer A. Gilg (we now present a temperature range for quartz formation of 40-95°C, instead of 40-80°C in the previous version; conclusions remain unchanged). These tables are introduced as electronic supplements to preserve the ms as short and clear as it was.Best regards, Benoit Quesnel and co-authors *Cover LetterDear Editor, Please find attached the revised version of manuscript #GCA-D-15-00678, entitled "Paired stable isotope (O, C) and clumped isotope thermometry of magnesite and silica veins in the ...

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Section: ) Provide More Details Of Clumped Isotope Methods and Calcumentioning

confidence: 99%

Paired stable isotopes (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe

Quesnel

Boulvais

Gautier

et al. 2016

Geochimica et Cosmochimica Acta

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“…The precision of the method is 0.2% for d 18 O and 0.1% for d 13 C. The isotope data are presented relative to the international VPDB standard (Craig 1957;Gonfiantini 1984). The isotopic fractionation factor used for magnesite is that proposed by Das Sharma et al (2002).…”

Section: Methodsmentioning

confidence: 99%

Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Luzón

Mayayo

Pérez

2008

Int J Earth Sci (Geol Rundsch)

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The sedimentary succession of Gallocanta lake, a closed saline lake located in the Iberian Range (NE Spain), documents two successive lacustrine stages: (1) brackish lake stage and (2) shallow saline lake stage. The saline stage corresponds to the present-day situation in which the lake water properties are mainly controlled by a strongly negative annual water balance. The carbonates of the brackish lake stage have relatively constant d 18 O values, however, they are rather high (d 18 O Do = 2.4% and d 18 O Cc = 4.5% mean values) suggesting a hydrologically closed lake with a long residence time of the waters. d 18 O values of carbonates from the saline stage vary greatly, and are lighter than in the previous stage (d 18 O Do = 0.5%, d 18 O Cc = -0.7%, d 18 O Mgs = -2.3% mean values).These carbonates also precipitated in a hydrologically closed lake, but in equilibrium with a lake water of more variable isotopic composition. The d 13 C values for carbonates of both stages reflect a mixing of different pools of carbon, but during saline stage d 13 C values have been more controlled by the equilibrium of the lake waters with atmospheric CO 2 . During the current stage, calcite and dolomite precipitate in Gallocanta lake mainly during spring and summer, although dolomite precipitation is more favoured towards the summer. Magnesite precipitates at the beginning of autumn, when the first rainfall re-dissolves the saline surface crust, producing saline waters with a high Mg 2+ content. The isotopic composition of lake waters sampled in 2005 are far higher than those calculated from the carbonates. It is considered that this could be due to two factors: either because there have not been many extremely dry years (like the year 2005) during the development of the lake, or because the physical and chemical characteristics of the lake waters in such conditions are not appropriate for the development of these minerals.

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“…The results were brought to the VPDB scale. The obtained δ 18 é values were corrected for -1 ‰ in order to account for fractionation between siderite and phosphoric acid at 70°ë [21,22]. However, the actual fractionation value was somewhat smaller due to the substitution of Fe 2+ for Ca and Mn.…”

Section: Methodsmentioning

confidence: 99%

Crystallization of authigenic carbonates in mud volcanoes at Lake Baikal

et al. 2008

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-This paper presents data on authigenic siderite first found in surface sediments from mud volcanoes in the Central (K-2) and Southern (Malen'kii) basins of Lake Baikal. Ca is the predominant cation, which substitutes Fe in the crystalline lattice of siderite. The enrichment of the carbonates in the 13 ë isotope (from +3.3 to +6.8‰ for the Malen'kii volcano and from +17.7 to +21.9‰ for K-2) results from the crystallization of the carbonates during methane generation via the bacterial destruction of organic matter (acetate). The overall depletion of the carbonates in 18 O is mainly inherited from the isotopic composition of Baikal water.

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Temperature dependence of oxygen isotope fractionation of CO 2 from magnesite-phosphoric acid reaction

Cited by 83 publications

References 12 publications

Paired stable isotopes (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe

Paired stable isotopes (O, C) and clumped isotope thermometry of magnesite and silica veins in the New Caledonia Peridotite Nappe

Stable isotope characterisation of co-existing carbonates from the Holocene Gallocanta lake (NE Spain): palaeolimnological implications

Crystallization of authigenic carbonates in mud volcanoes at Lake Baikal

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